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miv72 [106K]
3 years ago
5

Does anyone know how to solve this?

Mathematics
1 answer:
Margarita [4]3 years ago
4 0

Answer:

The correct option is c.

Step-by-step explanation:

Given that,

u = 7i+4j and v = 2i-3j

We need to find the product of u and v. The dot product of two vectors is given by :

u{\cdot}v=(7i+4j){\cdot} (2i-3j)\\\\=(7i)(2i)+(4j)(-3j)\\\\=14-12\\\\=2

So, the dot product of u and v is equal to 2.

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Nicky is considering two different companies for textbook rentals. For
maks197457 [2]

Answer:

if youre answer has to be a whole number it would be 3 otherwise it would be  x<4 ( so anything less than 4 )

Step-by-step explanation:

so because we are trying to find which company is less, we need to set up in inequality.

so first lets do company A

because 15 is our reoccuring fee, its going to be the coeifficient

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now lets do company B

because it only 20 every month we dont need to have a constant which means the equation for B would be

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15x + 20 > 20x ( remember our B side has to be less )

now lets solve it

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we know that if x = 4 then the two would be equal, which means our answer would have to be 3 months.

now always check your work.

15 (3) + 20 = 65

20(3) = 60

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If a circle has a diameter of 16 feet, which expression gives its area square feet?
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